做给别人看很简单,做给自己看却很难。
The language of mathematics is universal, transcending cultural and linguistic barriers.
战场交锋,即使列阵有方,但以勇猛为本;操办丧事,即使礼节周全,但以哀痛为本;文人学士,即使学富五车,但以德行为本
Change is inevitable, but growth is optional.